Mitsubishi S4S Service Manual page 92

ENGINE MAIN PARTS .
4. Pistons, Connecting Rods, Crankshaft, Crankcase and Tappets
4.1 Disassembly
Check for scratching, pitting,
flaking. chipping or loss of overlay.
NOTE: When replacing the crankcase, carefully
rernove the components (such as an
oil
pressure relief valve, etc.) to reuse them,
Check for c10gged oil hole.
Check for stripped
thread,
@ Main bearing (lower halt)
@ Crankshaft
@ Main bearing (upper halt)
(j])
Check valve
(direct injection with turbocharger)
(j]) Tappet
®
Crankcase
Check for wear, scoring, cracking, damaged or
widened ring grooves, clogged oil drain holes or
carbon deposits,
Check for fatigue.
Check for wear or darnage.
rJ) Snap ring
@ Piston pin
CID
Piston
®l
Connecting rod
®
Bearing cap bolt
®
Main bearing cap
®
Side seal
CID
Thrust plate
Check for scale deposits,
corrosion or other defects.
Check for pitting,
flaking,
chipping.
eracking, 105s of
overlay or signs
ofoverheating.
Check for cracking, scoring, wear
or clogged oil hole.
Check for nicking, chipping or
abnormal
tooth
contact
Check for
wear or
clogged oil
hole.
I
Disassembly sequence
I
CD
Nut
®
Connecting rad cap
@ Connecting rad bearing
Remove @ through
®l
as an
assembly.
@ Top compression ring
@ Second compression ring
@
ou
ring
7-30